//  Geometric Sequence

#include<bits/stdc++.h>

using namespace std;

int main() {
	int n;
	cin >> n;
	vector<long long> a(n);
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int i = 1; i < n - 1; i++) {
		if (a[i] * a[i] != a[i - 1] * a[i + 1]) {
			cout << "No";
			return 0;
		}
	}
	cout << "Yes";

	return 0;
}
